Single Choice

In the lac operon model, lactose molecules function as

AInducers, which bind with the operator gene
BRepressors, which bind with the operator gene
CInducers, which bind with the repressor protein
Correct Answer
DCorepressors, which bind with repressors protein

Solution

Inducer is a molecule that binds to repressor rendering it not able to bind to operator. In presence of lactose, allolactose; an isomer of lactose, binds to the repressor and causes an allosteric shift. The altered repressor can not bind to the operator, allowing RNA polymerase to transcribe the lac genes. Thus lactose serves as inducer. Correct answer is C.

SIMILAR QUESTIONS

Genetics

Which of the following is required as inducer(s) for the expression of Lac operon?

Genetics

All of the following are part of an operon except

Genetics

Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

Genetics

In the medium where E. coli was growing, lactose was added, which induced the lac operon. Then, why does lac operon shut down sometime after addition of lactose in the medium?

Genetics

Choose the correct answer from the alternatives given : The sequence of structural genes in lac operon is

Genetics

Choose the correct answer from the alternatives given : In E. Coli, the lac operon gets switched on when

Genetics

Choose the correct answer from the alternatives given : In E. Coli, the lac operon gets switched on when

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